-5y-15=7y+21

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Solution for -5y-15=7y+21 equation:


Simplifying
-5y + -15 = 7y + 21

Reorder the terms:
-15 + -5y = 7y + 21

Reorder the terms:
-15 + -5y = 21 + 7y

Solving
-15 + -5y = 21 + 7y

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-7y' to each side of the equation.
-15 + -5y + -7y = 21 + 7y + -7y

Combine like terms: -5y + -7y = -12y
-15 + -12y = 21 + 7y + -7y

Combine like terms: 7y + -7y = 0
-15 + -12y = 21 + 0
-15 + -12y = 21

Add '15' to each side of the equation.
-15 + 15 + -12y = 21 + 15

Combine like terms: -15 + 15 = 0
0 + -12y = 21 + 15
-12y = 21 + 15

Combine like terms: 21 + 15 = 36
-12y = 36

Divide each side by '-12'.
y = -3

Simplifying
y = -3

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